ANCHOR FOR SUPPORTING OF UNDERGROUND WORKINGS Russian patent published in 1998 - IPC

FIELD: mining industry. SUBSTANCE: anchor has screw-type rod turned in blast-hole. Tail-piece of anchor carries supporting member, spring, and additional rod. Coils of lower end of spring are located at face end of screw-type rod and are engaged with stop fastened between adjacent coils of screw-type rod. Enclosed between stop of screw-type rod and blast-hole face is stabilizing solution. Additional rod is located at side of face end of screw-type rod and is rigidly connected with some coils of upper end of spring turned towards blast-hole face. Spring coils are compressed with possibility of future extension under action of loads at side of rock matter. This allows for increasing load-carrying capacity of anchored roof of underground working. EFFECT: higher efficiency. 3 dwg